I'm very much an on top fan as opposed to being underneath (the wax, that is!)
Finding that the melts scent throw is a LOT stronger than the jars.
However I have found out two tips that may help Jar users to get best performance
(i) use a fitting ring of foil - like a doughnut and place on the top of the lit jar, the air hole only being an inch or so wide. It saves having to buy a pretty lid, does the same job melting the the jar wax right to the edge, and when you are done, you just throw the foil out, rather than having to clean the sooty flip side of the pretty metal lid - oh soot!! Just hate it!
(ii) If the jar wax gives no throw (which is approx 80% of cases) light it and place it sitting on your hob (ring off of course) :mysmilie_59:under your cooker hood - no need to turn cooker hood on. For some strange reason this placement 'draws up' the scent of the wax, giving a great throw!
Melts idea:
I find the melts give fantastic throw, but its a very expensive way as these melts gram for gram are quite expensive - I mix a fresh open tart with other Yankee less fragranced brand, for example I will split Vanilla cupcake with a crumbled sampler of Yankee Simply Home (Tesco) basic Vanilla, and it gives a good throw and not so pricey
I never throw out the faded used melts. When hardened, pop out, place in a ziplock bag. When you've saved enough, re-melt the lot together and pour into an empty glass jar (or pretty tea cups) with fresh wick. Its amazing as it burns down you will get different scents (the Yankee version of the Willy Wonka everlasting gob stopper!)